package org.bouncycastle.asn1;

import java.io.IOException;

/**
 * DER T61String (also the teletex string)
 */
public class DERT61String extends ASN1Object implements DERString {
    String string;

    /**
     * return a T61 string from the passed in object.
     * 
     * @exception IllegalArgumentException
     *                if the object cannot be converted.
     */
    public static DERT61String getInstance(Object obj) {
        if (obj == null || obj instanceof DERT61String) {
            return (DERT61String) obj;
        }

        throw new IllegalArgumentException("illegal object in getInstance: "
                + obj.getClass().getName());
    }

    /**
     * return an T61 String from a tagged object.
     * 
     * @param obj
     *            the tagged object holding the object we want
     * @param explicit
     *            true if the object is meant to be explicitly tagged false
     *            otherwise.
     * @exception IllegalArgumentException
     *                if the tagged object cannot be converted.
     */
    public static DERT61String getInstance(ASN1TaggedObject obj,
            boolean explicit) {
        DERObject o = obj.getObject();

        if (explicit) {
            return getInstance(o);
        } else {
            return new DERT61String(ASN1OctetString.getInstance(o).getOctets());
        }
    }

    /**
     * basic constructor - with bytes.
     */
    public DERT61String(byte[] string) {
        char[] cs = new char[string.length];

        for (int i = 0; i != cs.length; i++) {
            cs[i] = (char) (string[i] & 0xff);
        }

        this.string = new String(cs);
    }

    /**
     * basic constructor - with string.
     */
    public DERT61String(String string) {
        this.string = string;
    }

    public String getString() {
        return string;
    }

    public String toString() {
        return string;
    }

    void encode(DEROutputStream out) throws IOException {
        out.writeEncoded(T61_STRING, this.getOctets());
    }

    public byte[] getOctets() {
        char[] cs = string.toCharArray();
        byte[] bs = new byte[cs.length];

        for (int i = 0; i != cs.length; i++) {
            bs[i] = (byte) cs[i];
        }

        return bs;
    }

    boolean asn1Equals(DERObject o) {
        if (!(o instanceof DERT61String)) {
            return false;
        }

        return this.getString().equals(((DERT61String) o).getString());
    }

    public int hashCode() {
        return this.getString().hashCode();
    }
}
